Torvastad is a former municipality in Rogaland county, Norway.
The parish of Torvestad was established as a municipality January 1, 1838 (see formannskapsdistrikt). On 1 February 1855 the district Haugesund was separated from Torvastad to form a municipality of its own. The split left Torvastad with 3,242 inhabitants. Further division took place when Skåre broke out on 1 November 1881 and Utsira followed on 1 July 1924. At that time Torvastad had a population of 2,187.
At 1. January 2009 Torvastad-area(north-karmøy) had 3343 inhabitants, this includes: Storesund, Håland, Hauge and Bø. Source: http://www.karmoy.kommune.no/om-kommunen/demografi
On 1 January 1965 the district Vibrandsøy with 70 inhabitants were incorporated into Haugesund. The rest of Torvastad, with 3,783 inhabitants, was merged with Avaldsnes, Kopervik, Skudenes, Skudeneshavn, Stangaland and Åkra to form the new municipality Karmøy.